Telephone.



No. 728.162. PATENTED MAY 12, 1903.

W. L. DENIO.

TELEPHONE.

APPLICATION FILED PBB.B, 1903. N0 MODEL. 2 SHEETS-BEEF]! 1'.

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No. 728,162- PATENTED MAY 12. 1903.. v

W. L. DBNIO. TELEPHONE.

AP'PLIOATION FILED P33. 6. 1903.

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Patented May 12 1903:.

PATENT OFFICE.

WILLIALWI L. DENIO, OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE-HALF TOHOBART F. ATKINSON, OF ROCHESTER, NEW YORK.

TELEPHONE.

SPECIFICATION forming part of Letters iatent No. 728,162, dated May 12,1903. Application filed February 6, 1 903. (Serial No. 142,115. (NomodelJ' To all whom it rncty concern..- 1

Be it known that 1, WILLIAM L. DENIO, a citizen of the United States,residing at Rochester, in the State of New York, have invented anImprovement in Telephones, of whichthe following is a specification,reference being had to the accompanying drawings. 7 7

My invention relates to an improvement in telephones, the object ofwhich is to increase the sensibility and power of the instrument.

My improvements are fully described and illustrated in the followingspecification and the accompanying drawings, the novel features thereofbeing'specified in the claims annexed to the said specification.

In the accompanying drawings, Figure 1 is a section of atelephone-receiver. Fig. 2 is a plan view of the washer or gasket. Fig.3 is a side view of the washer or gasket. Figs. 4, 5, and 6 representmodifications.

In Fig. 1, A is the case of an ordinary telephonic receiver. Thethreaded cap B screws onto the end of the case A, holding" the diaphragm0 around the edge of its periphery between the corrugated washer orgasket D' and the cap B. E is a magnet, attached to the ends of whichare the coils F, which cause the diaphragm to vibrate when the instru-'ment is in operation. v,

Between the receiver-case A and the diaphragm O is placed the washer D,which is preferably made of sheet metal bent or corrugated, as shown inFigs. 2 and 3. The result of the corrugations is to hold the diaphragmfirmly, so that it cannot rattle, but at the same time to allow thediaphragm to vibrate much more freely than it'wouldif held rigidly, asin the ordinary receiver, thereby much increasing the sensitiveness oftheinstrument and the strength of the sound emitted by it. In theordinary telephone the diaphragm is held tightly between the case andthe cap, which restricts its vibration, or if the diaphragm is not heldtightly it rattles; but where my-invention is employed the diaphragm isheld firmly, preventing it from rattling, but at the same time leavingit so it can vibrate freely, thereby making a very sensitive instrumentand preventing the metallic tone frequently observed. The threaded cap Bprovides an easy means of adjusting the tepsion of the diaphragm so asto obtain the best results.

My improvement may be applied to telephones, phonographs, or anyacoustic instru- 5 5 ment having a vibrating diaphragm. I have observedthat the clearest tones and the greatestvolume of sound are secured whenthe [diaphragm is resiliently supported at an even :number of pointsaround its periphery.

The corrugated washer may be made of any suitable metal or alloy-vsuchas aluminium, brass, iron, Or-steel-although I prefer to employthe samematerial as in the diaphragm. I have also used washers of celluloid,hard rubber, paper, and fiber. As indicated in the drawings, the washeris placed on the same side of the diaphragm as the magnet, and I preferto use it in such location; but it may be placed on the other side, ortwo wash- 7o ers may be used, one on each side of the diaphragm. I havealso employed a concaved washer, such as indicated in Figs. 4 and 5,which may be divided or cut away to form independent bearing-points, asrepresented in Fig. 6.

' r 1. In a telephone or other acoustic instrumenthaving a vibratingdiaphragm, the combination with the diaphragm of the corru- 8o gatedwasher the magnet and the supportingcase, substantially as described.

2. In a telephone or other acoustic instrument having a vibratingdiaphragm, the combination with the diaphragm of the corrugated washerand the cap provided with means foradjusting the tension of thediaphragm, substantially as described.

3. In a telephone or other acoustic instrument having-a vibratingdiaphragm, the combination with a frame or case, of the diaphragm, thecorrugated washer and the cap, substantially as described.

WILLIAM L. D'ENIO.

Witnesses:

GEORGE A. GILLETTE,

H. R. SELDEN.

